UPDATE: OK I discovered something else. As mentioned prior, In Laptop mode,..the mouse activates the Play button with a single click and stops the playback by single-clicking on the play button with no issues. HOWEVER, I accidentally discovered that when I put it back into Tablet mode I can actually get the Play button to indeed work… BUT….only if I double-tap/click it with the stylus. I must also double-tap/click it to stop the playback with said stylus.